It is just the angles when talking about the doors and quarters. But in several colors there is an actual mismatch to the fascias/gas lid.... parts painted by a supplier. On my IBM, Ray Charles could have paint matched the fascias better. Lighter than the body, and a different metallic flake.

When I had my CGM, I could tell a difference where the quarters met the doors. I think it was angle cuz I couldnt see it all the time. My Summit White matches perfectly. Did you not notice this when you bought it? With even the gas cap looking different, Id be asking the dealer whats up, it shouldnt be that different.

If you notice differend shades on the same panel likd doors or quarter panels it is because of the viewing angles, no other explanation is possible. The gas door, front and rear fascia, rocker panels and door handles are the only parts painted at a different time than the rest of the body.